X+Y

Discussion in 'Biology & Genetics' started by Waiter_2001, Feb 12, 2016.

  1. Waiter_2001 Registered Senior Member

    Messages:
    459
    Hello. Please help, I'm a little confused. I'm aware the x and y genes determine whether someone is male or female but which way around is it?

    Is it:

    xx=male
    xy=female

    ...or...

    xy=female
    xx=male

    I'm also aware half genetic properties are from the father and half are from the mother but are all genetic strands on an x or y gene? I.e. are there only two strands (xx or xy) that contain all genetics material for the being. Thanks for your time. I look forward to your replies.
     
  2. Google AdSense Guest Advertisement



    to hide all adverts.
  3. origin Trump is the best argument against a democracy. Valued Senior Member

    Messages:
    9,796
    Google.
     
  4. Google AdSense Guest Advertisement



    to hide all adverts.
  5. sculptor Valued Senior Member

    Messages:
    4,416
    <-------------- heterogametic
     
  6. Google AdSense Guest Advertisement



    to hide all adverts.
  7. Daecon Kiwi fruit Valued Senior Member

    Messages:
    3,048
    Neither. XY is male and XX is female.
     
  8. DaveC426913 Valued Senior Member

    Messages:
    6,575
    No. The genes are spread across 23 chromosomes. Only one - the 23rd - defines the sex, thus:

    Please Register or Log in to view the hidden image!




    The Y chromosome is shorter than the X.


    The reason for this goes back to prehistoric times. Once upon a time, all creatures were XX only. Some XXs were wise and cautious and spent their time gathering food. But some XXs were stupid daredevils, who spent their time showing off, getting in trouble and generally making a mess of things.

    One day, a particularly goofy XX was swinging dangerously from the top of a tree, yelling "HEY Y'ALL! LOOK AT ME! LOOK AT ME!" while all the others below rolled their eyes. The goof slipped and fell out, landing hard. The fall busted off a corner of one of their X's, resulting in the first XY. (Not preventing them from proudly sporting their new cast like it was a trophy.)

    To this day, XYs still act like stupid goofs, showing off and getting themselves killed, while the XXs roll their eyes and go about their business.

    Thus endeth the lesson.
     
    Last edited: Feb 12, 2016
    ajanta and Michlt like this.
  9. sculptor Valued Senior Member

    Messages:
    4,416
    Leave us not to forget the tall XXX females(.1%) and the XYY males(.1%)
    and more
     
  10. timojin Valued Senior Member

    Messages:
    3,042
    So what information do you have ?
     
  11. DaveC426913 Valued Senior Member

    Messages:
    6,575
    Odd question. The information he provided answered the OP's question.
     
  12. Waiter_2001 Registered Senior Member

    Messages:
    459
    Thanks people.

    xx=Female.
     
  13. Waiter_2001 Registered Senior Member

    Messages:
    459
    So if the second generation have four children does the D.N.A fall as follows:

    xx:xy
    xx:xx:xx:xy

    ?
     
  14. sculptor Valued Senior Member

    Messages:
    4,416
    No.
     
  15. DaveC426913 Valued Senior Member

    Messages:
    6,575
    No. The sperm contains half of the chromosomes - each sperm is either X or Y. So, upon insemination, an egg will contain one of the female's Xs plus the male's X or Y.

    So the four possibilities are:
    Mom provides X1, dad provides Y: boy
    Mom provides X1, dad provides X: girl
    Mom provides X2, dad provides Y: boy
    Mom provides X2, dad provides X: girl
     
  16. sculptor Valued Senior Member

    Messages:
    4,416
    If I remember well that part of my education:
    A woman's vagina is a caustic acidic inhospitable place for a poor sperm.
    Y sperm are faster(and die younger), while X sperm are sturdier(and live longer).
    Orgasm makes the vagina more alkaline & less inhospitable, giving the edge to y sperm.
    Sex at the time of ovulation gives the edge to y sperm, while sex 3 days prior to ovulation gives the edge to x sperm.

    See Shettles' work on the subject.
    ..................
    'tis a race between millions of individuals and only one can win the egg.
    unless, of course, the fsh has stimulated multiple eggs as is more common in women in their 30s.
    According to the CDC, the incidence of twinning has increased from one in 53 live births in 1980 to one in 31 live births in 2008.
    This may be the result of more women starting families in their 30s when they are more likely to drop 2 eggs?
     
    Last edited: Feb 13, 2016
  17. James R Just this guy, you know? Staff Member

    Messages:
    30,353
    You should be able to work out whether this is likely to be true yourself. Think about it.

    When you look at the world, do you see three times as many women as men? Because that's what your xx:xx:xx:xy is saying there would be, if it were true.
     
  18. DaveC426913 Valued Senior Member

    Messages:
    6,575
    Your mama's been lying to you.

    Please Register or Log in to view the hidden image!

    Please Register or Log in to view the hidden image!

    Please Register or Log in to view the hidden image!

     
  19. sculptor Valued Senior Member

    Messages:
    4,416
    Mamma's been dead these past 16 years. Her ashes are in an urn on a shelf in my brother's living room. Maybe, he's even kinkier than am I.
    Though maybe inhospitable for some sperm, but I've rather enjoyed my visits there.
     
    DaveC426913 likes this.

Share This Page